PT-2026-31416 · Zammad · Zammad
CVE-2026-34719
·
Published
2026-04-08
·
Updated
2026-04-09
CVSS v4.0
8.3
High
| Vector | AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:H/SC:L/SI:N/SA:H |
Name of the Vulnerable Software and Affected Versions
Zammad versions prior to 7.0.1 and prior to 6.5.4
Description
Zammad, a web-based open-source helpdesk/customer support system, had insufficient validation in its webhook model for loopback or link-local addresses. Only the URL scheme (HTTP/HTTPS) and hostname were checked, potentially allowing the retrieval of confidential metadata from cloud or hosting providers. The validation has been extended and is now applied during webhook configuration and job triggering.
Recommendations
Update to Zammad version 7.0.1 or later.
Update to Zammad version 6.5.4 or later.
Exploit
Fix
SSRF
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Weakness Enumeration
Related Identifiers
Affected Products
Zammad